* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.container {
    width: 90%;
    margin: 0 auto;
    position: relative;
    /* 消除换行边距 */
    font-size: 0;               
}

.item {
    width: 200px;
    height: auto;
    position: absolute;
    padding: 5px;
}

.item img {
    width: 100%;
    border-radius: 5px;
}



